Coaxial cable connecting line

Abstract

The utility model discloses a coaxial cable connecting line, which sequentially comprises a central conductor, an insulating layer, a shielding layer and an outer sheath from inside to outside, the central conductor is formed by twisting a plurality of strands of silver-plated copper wires, and the insulating layer is made of polytetrafluoroethylene materials; the shielding layer is divided into an inner shielding layer and an outer shielding layer, the inner shielding layer adopts a nano composite material film, and the outer shielding layer adopts a double-layer reverse weaving structure; and the outer sheath is made of a polyolefin material. According to the utility model, through innovative structural design and material system optimization, collaborative improvement of high-frequency transmission performance, mechanical stability and durability is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable technical field, and particularly relates to a coaxial cable connecting line. BACKGROUND

[0002] The traditional coaxial cable concentrates current on the surface of the conductor (skin effect) when high frequency, increases the resistance loss, and meanwhile, the dielectric loss of the insulating material increases with the increase of the frequency. For example, the attenuation value of the RG series cable is generally more than 2dB / m at 10GHz frequency band. At present, the braided shielding layer is adopted in most coaxial cables, which is interwoven by metal wires. When dynamically bending, the metal wires may be displaced or broken, forming a gap, so that electromagnetic wave leaks. The more the bending amplitude and the cycle number, the larger the gap, and the more obvious the decrease of the shielding effectiveness. SUMMARY

[0003] In order to solve the above problems, the utility model provides a coaxial cable connecting line, which can effectively reduce the resistance loss and avoid the decrease of the shielding effectiveness caused by bending.

[0004] Therefore, the technical scheme of the utility model is as follows: a coaxial cable connecting line comprises, from inside to outside, a center conductor, an insulating layer, a shielding layer and an outer sheath. The center conductor is twisted by multiple silver-plated copper wires, and the insulating layer is made of polytetrafluoroethylene material. The shielding layer is divided into an inner shielding layer and an outer shielding layer. The inner shielding layer is made of a nanocomposite film, and the outer shielding layer is made of a double-layer reverse braided structure. The outer sheath is made of polyolefin material.

[0005] On the basis of the above scheme and as a preferred scheme of the above scheme, the nanocomposite film is a graphene / polyvinylidene fluoride nanometer conductive film with a thickness of 0.05mm.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme, the double-layer reverse braided structure comprises an inner layer structure and an outer layer structure. The inner layer structure is braided by 0.05mm tinned copper wire with a braiding angle of counterclockwise 125°. The outer layer structure is braided by 0.03mm copper-nickel-silicon alloy wire with a braiding angle of clockwise 55°, and the total braiding density is greater than or equal to 98.5%.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme, a filling layer is arranged between the inner layer structure and the outer layer structure of the outer shielding layer. The filling layer is made of silicone rubber or foamed PTFE, and the porosity is 30-50%.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme, the insulating layer is made of gradient foamed polytetrafluoroethylene material with a foaming degree of 85%, an inner layer porosity diameter of 10-15μm, an outer layer porosity diameter of 5-8μm and a thickness of 0.8±0.05mm.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the outer sheath is divided into three layers, the inner layer is a conductive carbon black modified layer, the middle layer is an aramid fiber reinforced layer, and the outer layer is a UV stabilizing layer, and the thickness ratio of the three layers is 3:5:2.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. An inner shielding layer and an outer shielding layer are set up. The graphene / polyvinylidene fluoride nano-conductive film and the double-layer reverse braided structure form stress complementarity, which improves the static shielding capability of the cable and reduces the shielding effectiveness attenuation after dynamic bending. The middle is filled with silicone rubber / foamed PTFE, which can provide elastic buffer and suppress the friction and wear of the braided layer.

[0012] 2. The outer sheath adopts a three-layer structure, which can significantly improve the tensile strength of the cable and extend its bending fatigue life. Through innovative structural design and material system optimization, it achieves a synergistic improvement in high-frequency transmission performance, mechanical stability and durability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the shielding layer of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the outer sheath of this utility model.

[0016] The components in the diagram are labeled as follows: center conductor 1, insulation layer 2, inner shielding layer 31, inner layer structure 32, outer layer structure 33, filling layer 34, outer sheath 4, conductive carbon black modified layer 41, aramid fiber reinforced layer 42, and UV stabilizing layer 43. Detailed Implementation

[0017] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0018] In addition, if the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first", "second" features can be explicitly or implicitly include one or more features, in the description of the utility model, the meaning of "several", "several" is two or more than two, unless otherwise explicitly specified.

[0019] Referring to the drawings. The coaxial cable connecting line described in this embodiment includes center conductor 1, insulating layer 2, shielding layer and outer sheath 4 from inside to outside.

[0020] The center conductor is 7 strands of silver plated copper wire twisted together, and the diameter of the silver plated copper wire is 1.2±0.02mm;

[0021] The insulating layer 2 adopts gradient foaming polytetrafluoroethylene material, the foaming degree is 85%, and the porosity is radially gradient distribution, the inner layer pore diameter is 10-15μm, the outer layer is 5-8μm, the thickness is 0.8±0.05mm, and the dielectric constant is 1.8(1GHz).

[0022] The shielding layer is divided into inner shielding layer 31 and outer shielding layer, the inner shielding layer adopts nanocomposite film, and the graphene / polyvinylidene fluoride nanocomposite is formed into 0.05mm thick conductive film by magnetron sputtering process.

[0023] The outer shielding layer adopts double-layer reverse braiding structure; the double-layer reverse braiding structure includes inner layer structure 32 and outer layer structure 33, the inner layer structure 32 is woven by 0.05mm tinned copper wire, and the braiding angle is counterclockwise 125°; the outer layer structure 33 is woven by 0.03mm copper nickel silicon alloy wire, and the braiding angle is clockwise 55°, and the total braiding density is greater than or equal to 98.5%. The inner layer structure 32 and the outer layer structure 33 of the outer shielding layer are provided with a filling layer 34, and the filling layer is silicone rubber or foamed PTFE, and the porosity is 30-50%.

[0024] The outer sheath 4 is made of polyolefin material, the thickness is 1.0mm, the oxygen index is greater than or equal to 32%, the tensile strength is greater than or equal to 15MPa, and it contains 3 layers of co-extrusion structure, the inner layer is conductive carbon black modified layer 41, the middle layer is aramid fiber reinforced layer 42, and the outer layer is UV stabilizing layer 43, and the thickness ratio of the three layers is 3:5:2. The conductive carbon black modified layer is made of polyolefin material doped with conductive carbon black, the aramid fiber reinforced layer is made of polyolefin material doped with aramid fiber, and the UV stabilizing layer is made of polyolefin material doped with benzotriazole UV stabilizer.

[0025] The performance comparison of the embodiment and the conventional RG cable is as follows:

[0026]

[0027] From the above table, compared with the traditional RG cable, the 10GHz attenuation value of the cable of the embodiment is reduced by 52%, the 40GHz shielding effectiveness is increased by 10dB, the minimum bending radius is reduced by 33%, the bending cycle life is increased by 5 times, and the sheath tensile strength is increased by 83%.

[0028] The embodiment realizes the synergistic improvement of high-frequency transmission performance, mechanical stability and durability through innovative structural design and material system optimization.

[0029] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments. Any technical solution falling within the concept of the present application belongs to the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application are also considered as the protection scope of the present application.

Claims

1. A coaxial cable connector, comprising, from the inside out, a center conductor, an insulation layer, a shielding layer, and an outer sheath, wherein the center conductor is composed of multiple strands of silver-plated copper wire twisted together, and the insulation layer is made of polytetrafluoroethylene (PTFE); characterized in that: The shielding layer is divided into an inner shielding layer and an outer shielding layer, the inner shielding layer adopts a nanocomposite film, and the outer shielding layer adopts a double-layer reverse braiding structure; the outer sheath is made of polyolefin material.

2. A coaxial cable connector as defined in Claim 1, wherein: The nanocomposite film is a graphene / polyvinylidene fluoride nanometer conductive film with a thickness of 0.05 mm.

3. A coaxial cable connector as recited in claim 1, wherein: The double-layer reverse braiding structure comprises an inner layer structure and an outer layer structure, the inner layer structure is braided by 0.05 mm tinned copper wire with a reverse clockwise 125° braiding angle, and the outer layer structure is braided by 0.03 mm copper-nickelsilicon alloy wire with a clockwise 55° braiding angle, and the total braiding density is greater than or equal to 98.5%.

4. A coaxial cable connector as defined in Claim 3, wherein: The inner layer structure and the outer layer structure of the outer shielding layer are provided with a filling layer, the filling layer is silicone rubber or foamed PTFE with a porosity of 30-50%.

5. A coaxial cable connector as recited in claim 1, wherein: The insulating layer is a gradient foamed polytetrafluoroethylene material with a foaming degree of 85%, an inner layer pore diameter of 10-15 μm, an outer layer pore diameter of 5-8 μm, and a thickness of 0.8±0.05 mm.

6. A coaxial cable connector as recited in claim 1, wherein: The outer sheath is divided into three layers, an inner layer of conductive carbon black modified layer, a middle layer of aramid fiber reinforced layer, and an outer layer of UV stable layer, and the thickness ratio of the three layers is 3:5:2.

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